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article

A Curvature and Density‐based Generative Representation of Shapes

Z. Ye, N. Umetani, T. Igarashi, T. Hoffmann

Computer Graphics Forum > 40 > 1 > 38 - 53

This paper introduces a generative model for 3D surfaces based on a representation of shapes with mean curvature and metric, which are invariant under rigid transformation. Hence, compared with existing 3D machine learning frameworks, our model substantially reduces the influence of translation and rotation. In addition, the local structure of shapes will be more precisely captured, since the curvature...

article

ECHO: Extended Convolution Histogram of Orientations for Local Surface Description

Thomas W. Mitchel, Szymon Rusinkiewicz, Gregory S. Chirikjian, Michael Kazhdan

Computer Graphics Forum > 40 > 1 > 180 - 194

This paper presents a novel, highly distinctive and robust local surface feature descriptor. Our descriptor is predicated on a simple observation: instead of describing the points in the vicinity of a feature point relative to a reference frame at the feature point, all points in the region describe the feature point relative to their own frames. Isometry invariance is a byproduct of this construction...

article

A genetic algorithm and B&B algorithm for integrated production scheduling, preventiveand corrective maintenance to save energy

Assia, Sadiqi, Ikram, El Abbassi, Abdellah, El Barkany, Moumen, Darcherif, more

Management and Production Engineering Review > 2020 > 11 > 4

article

Research of air movement in the labyrinth seal of rollers of conveyor belt

Kononov, G., Artemov, S., Dubrovskyi, S., Kravtsova, Dariya, more

Archive of Mechanical Engineering > 2019 > 66 > 4

article

Optimizing electricity costs during integrated scheduling of jobs and stochastic preventive maintenanceunder time-of-use electricity tariffs

Assia, Sadiqi, Ikram, El Abbassi, Abdellah, El Barkany, Moumen, Darcherif, more

Management and Production Engineering Review > 2019 > 10 > 4

article

Graph‐Based Wavelet Representation of Multi‐Variate Terrain Data

Teodor Cioaca, Bogdan Dumitrescu, Mihai‐Sorin Stupariu

Computer Graphics Forum > 35 > 1 > 44 - 58

Terrain data can be processed from the double perspective of computer graphics and graph theory. We propose a hybrid method that uses geometrical and vertex attribute information to construct a weighted graph reflecting the variability of the vertex data. As a planar graph, a generic terrain data set is subjected to a geometry‐sensitive vertex partitioning procedure. Through the use of a combined,...

article

Supporting Focus and Context Awareness in 3D Modelling Tasks Using Multi‐Layered Displays

M. Masoodian, A. b. Mohd Yusof, B. Rogers

Computer Graphics Forum > 34 > 6 > 1 - 12

Most 3D modelling software have been developed for conventional 2D displays, and as such, lack support for true depth perception. This contributes to making polygonal 3D modelling tasks challenging, particularly when models are complex and consist of a large number of overlapping components (e.g. vertices, edges) and objects (i.e. parts). Research has shown that users of 3D modelling software often...

article

A comprehensive modeling framework for role-based access control policies

Ameni Ben Fadhel, Domenico Bianculli, Lionel Briand, A. Ben Fadhel, more

The Journal of Systems & Software > 2015 > 107 > Complete > 110-126

Prohibiting unauthorized access to critical resources and data has become a major requirement for enterprises; access control (AC) mechanisms manage requests from users to access system resources. One of the most used AC paradigms is role-based access control (RBAC), in which access rights are determined based on the user’s role.Many different types of RBAC policies have been proposed in the literature,...

article

Modeling of Increased Open Circuit Voltage through Localized Emitter Area on Silicon Solar Cells

Peinan Teng, Xinrui An, Craig Johnson, Stuart Wenham, more

Energy Procedia > 2015 > 77 > Complete > 651-657

A limited area p-n junction approach can increase the open circuit voltage (Voc) of silicon solar cells when the emitter recombination dominates. A limited area p-n junction silicon solar cell is designed and the effect of reducing emitter areas on the Voc, short circuit current (Jsc) and fill factor (FF) is studied using the 3-D simulator Quokka. This paper compares the modelling result of this approach...

article

Observations and modeling of alongshore variability in dune erosion at Egmond aan Zee, the Netherlands

R.C. de Winter, F. Gongriep, B.G. Ruessink, R.C. de Winter, more

Coastal Engineering > 2015 > 99 > Complete > 167-175

Dunes can erode within a few hours when exposed to high storm surge levels and large waves. If the dunes are the primary defense, such as in the Netherlands, this could result in flooding of the hinterland when dunes breach. Models are often used to analyze how dunes will respond to extreme conditions, but they can also be applied to study milder events, and with that gain more insight in the processes...

article

Ignition time of nanopowders during milling: A novel simulation

Reza Ebrahimi-Kahrizsangi, Majid Abdellahi, Maryam Bahmanpour, R. Ebrahimi-Kahrizsangi, more

Powder Technology > 2015 > 272 > Complete > 224-234

Detecting the sudden temperature increase of the milling vial, detecting the sudden total pressure increase inside the vial as well as XRD analysis from the synthesized phases are techniques that can be used to determine the ignition time in mechanically self-sustaining reactions (MSRs) induced by ball milling. In the present study a novel technique based on the Gene Expression Programming (GEP) algorithm...

article

Processing fine powders by roll press

Vivien Esnault, Abderrahim Michrafy, Daniel Heitzmann, Mohamed Michrafy, more

Powder Technology > 2015 > 270 > Part B > 484-489

The gas trapped into fine powders causes specific problems like feeding disturbances during roll compaction process. In this study, the gas flow and its effect on the rolling process are numerically investigated in the rolling direction, using Darcy's law and assuming the permeability as a function of both material density and particle size through Carman–Kozeny relationship. The solid properties...

article

A survey of prostate modeling for image analysis

O. Chilali, A. Ouzzane, M. Diaf, N. Betrouni, more

Computers in Biology and Medicine > 2014 > 53 > Complete > 190-202

Computer technology is widely used for multimodal image analysis of the prostate gland. Several techniques have been developed, most of which incorporate a priori knowledge extracted from organ features. Knowledge extraction and modeling are multi-step tasks. Here, we review these steps and classify the modeling according to the data analysis methods employed and the features used. We conclude with...

article

Nonlinear programming optimization of series and parallel cyclone arrangement of NPK fertilizer plants

Sabah Ahmed Abdul-Wahab, Muhamad Fariz Failaka, Lena Ahmadi, Ali Elkamel, more

Powder Technology > 2014 > 264 > Complete > 203-215

The gas–solid cyclone has been remarkably widely used among all types of industrial gas-cleaning devices. The objective of this work was to present the nonlinear optimization modeling of series and parallel cyclone arrangement for 1D3D, 2D2D and 1D2D cyclones of the Nitrogen, Phosphorus, and Potassium (NPK) fertilizer plant. The numerical solutions were carried out using the General Algebraic Modeling...

article

Supercritical fluid extraction of vegetable matrices: Applications, trends and future perspectives of a convincing green technology

M.M.R. de Melo, A.J.D. Silvestre, C.M. Silva, M.M.R. de Melo, more

The Journal of Supercritical Fluids > 2014 > 92 > Complete > 115-176

Along more than a decade, R&D on supercritical fluid extraction (SFE) of vegetable matrices has been increasingly reported in the literature. Aiming at portraying the current state of this field and its evolution in terms of raw materials, products, modes of operation, optimization, modeling techniques, and closeness to industrial application, a large compilation of almost 600 essays from 2000...

article

Modeling of pool spreading of LNG on land

Omar Basha, Tomasz Olewski, Luc Véchot, Marcelo Castier, more

Journal of Loss Prevention in the Process Industries > 2014 > 30 > Complete > 307-314

This paper presents a source term model for estimating the rate of spreading of LNG and other cryogenic mixtures on unconfined land. The model takes into account the composition changes of a boiling mixture, the varying thermodynamic properties due to preferential boiling within the mixture and the effect of the various boiling regimes on conductive heat transfer. A sensitivity analysis is conducted...

article

Modeling the transport of sulfuric acid and its sulfates (MgSO4, ZnSO4, Na2SO4) through an anion-exchange membrane

Stanisław Koter, Monika Kultys, Barbara Gilewicz-Łukasik, Izabela Koter, more

Desalination > 2014 > 342 > Complete > 75-84

The separation of sulfuric acid from its sulfates (MgSO ₄ , ZnSO ₄ , Na ₂ SO ₄ ) by the electrodialytic method was investigated. The weak-basic anion-exchange membrane Selemion AAV was used. It was found that the current efficiency of anion transport (HSO ₄ ⁻ , SO ₄ ²⁻ ) was independent on the kind of metal cation present on the cathode side...

article

Processing, characterization and modeling of recycled polypropylene/glass fibre/wood flour composites

M.A. Al-Maadeed, Yasser M. Shabana, P. Noorunnisa Khanam, M.A. Al-Maadeed, more

Materials and Design > 2014 > 58 > Complete > 374-380

Polypropylene (PP) is one of the most common thermoplastic materials in the world. There is a need to recycle the large amount of this used material. To overcome the environmental problems, related to the polymer waste, PP was recycled and used as a matrix material in different composites that can be used in high value applications. In this paper, composites made of recycled polypropylene (RPP) reinforced...

article

On improving solid friction factor modeling for fluidized dense-phase pneumatic conveying systems

G. Setia, S.S. Mallick, P.W. Wypych, G. Setia, more

Powder Technology > 2014 > 257 > Complete > 88-103

This paper presents results from an ongoing investigation into the modeling of solid friction factor for fluidized dense-phase pneumatic transport of powders. In spite of having the potential of being an energy economic and a better maintenance free mode of pneumatic transport, reliable design of fluidized dense-phase pneumatic conveying systems is still a difficult task due to the highly turbulent...

article

Application of expert systems for accurate determination of dew-point pressure of gas condensate reservoirs

Hadi Rostami-Hosseinkhani, Feridun Esmaeilzadeh, Dariush Mowla, H. Rostami-Hosseinkhani, more

Journal of Natural Gas Science and Engineering > 2014 > 18 > Complete > 296-303

Dew-point pressure is a parameter that has a key role in development of gas condensate reservoirs. Dropping of reservoir pressure below the dew-point pressure results in a decrease in production because of near wellbore blockage. In addition, due to separation of liquids, the produced gas has fewer valuable components. This study tries to develop a dependable method based on machine learning to adequately...

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Search results

A Curvature and Density‐based Generative Representation of Shapes

ECHO: Extended Convolution Histogram of Orientations for Local Surface Description

A genetic algorithm and B&B algorithm for integrated production scheduling, preventiveand corrective maintenance to save energy

Research of air movement in the labyrinth seal of rollers of conveyor belt

Optimizing electricity costs during integrated scheduling of jobs and stochastic preventive maintenanceunder time-of-use electricity tariffs

Graph‐Based Wavelet Representation of Multi‐Variate Terrain Data

Supporting Focus and Context Awareness in 3D Modelling Tasks Using Multi‐Layered Displays

A comprehensive modeling framework for role-based access control policies

Modeling of Increased Open Circuit Voltage through Localized Emitter Area on Silicon Solar Cells

Observations and modeling of alongshore variability in dune erosion at Egmond aan Zee, the Netherlands

Ignition time of nanopowders during milling: A novel simulation

Processing fine powders by roll press

A survey of prostate modeling for image analysis

Nonlinear programming optimization of series and parallel cyclone arrangement of NPK fertilizer plants

Supercritical fluid extraction of vegetable matrices: Applications, trends and future perspectives of a convincing green technology

Modeling of pool spreading of LNG on land

Modeling the transport of sulfuric acid and its sulfates (MgSO4, ZnSO4, Na2SO4) through an anion-exchange membrane

Processing, characterization and modeling of recycled polypropylene/glass fibre/wood flour composites

On improving solid friction factor modeling for fluidized dense-phase pneumatic conveying systems

Application of expert systems for accurate determination of dew-point pressure of gas condensate reservoirs

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